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3 - I have a professional (Separate) navigation software. If I hook the IPhone, can I see / use the GPS signals in that navigation software in the middle of the ocean, away from cell phone provider's signals, directly using the GPS signals from satellites?

I have an update about Compass app and the Lat and Long display. I truned 3G and cellular data options off to double check on the GPS reception; and the compass continues working but Lat and Long reception feature does not.

I was about to say, the Compass app should work without any incoming data, though it might be slower than when it has access to GPS data.

As for GPS and maps, no -- they need cell or wi-fi signal (and thus data) to position you. The GPS data requires you be using either 3G or wi-fi -- doesn't matter which, but you gotta have it.

Why is this? I thought there was an actual GPS receiver - and while not exactly the best performing receiver in the business - could still obtain a position fix without cell. I just experimented with my iPad 3G and was able to get a lat long position and GPS signal having first turned off cell and wi-fi services. Not airplane mode which will inhibit the GPS receiver.